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- W2034371514 abstract "Ca2+-dependent regulation of the ion current through the alpha1Cbeta2aalpha2delta-1 (L-type) calcium channel transiently expressed in HEK 293 cells was investigated using whole cell patch clamp method. Ca2+ or Na+ ions were used as a charge carrier. Intracellular Ca2+ was either buffered by 10 mM EGTA or 200 microM Ca2+ was added into non-buffered intracellular solution. Free intracellular Ca2+ inactivated permanently about 80% of the L-type calcium current. The L-type calcium channel inactivated during a depolarizing pulse with two time constants, tau(fast) and tau(slow). Free intracellular calcium accelerated both time constants. Effect on the tau(slow) was more pronounced. About 80% of the channel inactivation during brief depolarizing pulse could be attributed to a Ca2+-dependent mechanism and 20% to a voltage-dependent mechanism. When Na+ ions were used as a charge carrier, the L-type current still inactivated with two time constants that were 10 times slower and were virtually voltage-independent. Ca2+ ions stabilized the inactivated state of the channel in a concentration-dependent manner." @default.
- W2034371514 created "2016-06-24" @default.
- W2034371514 creator A5016660545 @default.
- W2034371514 creator A5091874127 @default.
- W2034371514 date "2005-05-01" @default.
- W2034371514 modified "2023-10-14" @default.
- W2034371514 title "Ca2+- and voltage-dependent inactivation of the expressed L-type Cav1.2 calcium channel" @default.
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- W2034371514 doi "https://doi.org/10.1016/j.abb.2005.02.025" @default.
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